It really depends on what you're doing. PvE - Fatebringer, every time. I even use it in Crota HM because the splash damage for precision kills is so good. PvP - Thorn/The Last Word, they have the highest DPS of any Handcannon in the game for PvP. Timur's Lash with Armor Pen rounds can literally 2 shot somebody though, so it's a solid choice as well. Word of Crota is lackluster in my opinion. Sure, it's great for Void Burn Nightfalls, but that's it. The Legendary perk it comes with isn't better than Fatebringer's though.